US20170108806A1 - Image forming apparatus with fuser driver and method for controlling thereof - Google Patents
Image forming apparatus with fuser driver and method for controlling thereof Download PDFInfo
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- US20170108806A1 US20170108806A1 US15/069,159 US201615069159A US2017108806A1 US 20170108806 A1 US20170108806 A1 US 20170108806A1 US 201615069159 A US201615069159 A US 201615069159A US 2017108806 A1 US2017108806 A1 US 2017108806A1
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- heating element
- fuser
- power
- temperature
- image forming
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
- G03G15/205—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the mode of operation, e.g. standby, warming-up, error
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5004—Power supply control, e.g. power-saving mode, automatic power turn-off
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/80—Details relating to power supplies, circuits boards, electrical connections
Abstract
Description
- This application claims priority from Korean Patent Application No. 10-2015-0146110, filed on Oct. 20, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.
- 1. Field
- The following description relates to an image forming apparatus and a controlling method thereof, and more particularly, to an image forming apparatus capable of preventing noise while satisfying flicker standards, and a controlling method thereof.
- 2. Description of the Related Art
- An image forming apparatus refers to an apparatus configured to print on printing paper print data generated in a printing control terminal apparatus such as a computer. Examples of such an image forming apparatus include a copy machine, printer, facsimile, and an MFP (Multi Function Peripheral) that provides all the functions of a copy machine, printer, and facsimile through one device.
- An image forming apparatus is capable of forming an image in various methods. One of those methods is the electrophotography method. The electrophotography method includes electrifying a photosensitive body, forming a latent image through light exposure, performing a developing operation of applying a toner on the latent image, transcribing the developed toner on printing paper, and fusing the same, thereby forming an image.
- Thus, an image forming apparatus may adopt a configuration for ultimately fusing an image on printing paper. This configuration is referred to as a fuser.
- Meanwhile, electric, electronic, and communication devices must satisfy various EMC standards, among which harmonic standards and flicker standards are related to fusing operations of the image forming apparatus.
- In order to satisfy the aforementioned flicker standards, a phase control may be used in a fuser, but conventional phase control methods lead to rapid current changes (di/dt) in harmonic inductors mounted to satisfy the harmonic standards, thereby generating noise, which is a problem.
- Therefore, there is needed a method for driving a fuser with reduced noise while satisfying the flicker standards.
- Additional aspects and/or advantages will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure.
- Various embodiments of the present disclosure are directed to provide an image forming apparatus capable of preventing noise while satisfying the flicker standards, and a controlling method thereof.
- According to an embodiment of the present disclosure, an image forming apparatus includes a fuser configured to fuse printing paper where a toner has been developed; and a fuser driver configured to provide power being provided from an external AC to a heating element inside the fuser so that the fuser has a predetermined temperature, wherein, in response to an operational state of the image forming apparatus being at a waiting state, the fuser driver performs a phase control on the power being provided to the heating element using AC power of sections other than a phase angle of a range predetermined based on a peak voltage value of the external AC power.
- In this case, in response to the operational state of the image forming apparatus being at a printing state, the fuser driver may perform a phase control on power being provided to the heating element using AC power of all sections.
- Meanwhile, in response to a temperature of the fuser being in a first temperature range, the fuser driver may perform a phase control on the AC power being provided to the heating element, and in response to the temperature of the fuser being in a second temperature range that is higher than the first temperature range, the fuser driver may perform a waveform number control on the AC power being provided to the heating element.
- Meanwhile, the fuser driver may perform a phase control such that the AC power is not provided to the heating element in sections where the phase of the external AC power is 75 to 105 degrees and 255 degrees to 285 degrees.
- Meanwhile, the heating element may include a first heating element and a second heating element, and the image forming apparatus may further include a plurality of switching elements for changing a connection state of the first heating element and second heating element with the external power to be in series or in parallel, and the fuser driver may control the plurality of switching elements such that, in response to the operational state of the image forming apparatus being at a waiting state, the first heating element and second heating element are connected to the external power in series, and in response to the operational state of the image forming apparatus being at a printing state, the first heating element and second heating element are connected to the external power in parallel.
- Meanwhile, the fuser driver may include an input configured to receive input of external AC power; a zero cross sensor configured to sense a zero cross point of the input AC power, temperature sensor configured to sense a temperature of the fuser; a switching element configured to selectively output the input AC power to the heating element; and a fuser controller configured to control operations of the switching element using the sensed zero cross point and sensed temperature of the fuser.
- Meanwhile, the fuser controller may compare the sensed temperature and predetermined target temperature and compute a duty value, calculate a phase control time of the AC power to be provided to the fuser using the computed duty value and sensed zero cross point, and control the switching element based on the calculated phase control time.
- Meanwhile, in response to the sensed temperature being the same or above a predetermined temperature range, the fuser controller may perform a waveform number control regarding the AC power being provided to the heating element.
- Meanwhile, the switching element may be a TRIAC.
- Meanwhile, the fuser driver may further include a coil arranged between the switching element and heating element.
- Meanwhile, the fuser driver may further include a rectifier configured to wave-rectify the input external AC; and a coil arranged between the input end and rectifier, wherein the switching element is a field-effect transistor.
- According to an embodiment of the present disclosure, an image forming apparatus includes a fuser configured to fuse printing paper where a toner has been developed; and a fuser driver configured to provide power being provided from an external AC to a first heating element and second heating element inside the fuser so that the fuser has a predetermined temperature, wherein, in response to an operational state of the image forming apparatus being at a waiting state, the fuser driver connects the first heating element and second heating element in series and provides the external AC, and in response to the operational state of the image forming apparatus being at a printing state, the fuser driver connects the first heating element and second heating element in parallel and provides the external AC.
- Meanwhile, the fuse driver may include a temperature sensor configured to sense a temperature of the fuser, an input configured to receive input of the external AC, a coil connected to one end of the input, a first switching element arranged between the coil and first heating element and configured to selectively provide the external AC to the first heating element, a second switching element arranged between the coil and second heating element and configured to selectively provide the external AC to the second heating element, a third switching element configured to selectively connect another end of the first heating element with one end of the second heating element, a fourth switching element configured to selectively connect another end of the first heating element with another end of the input; and a fuser controller configured to, in response to the operational state of the image forming apparatus being at a waiting state, control the fourth switching element to maintain a turn-on state, and the second switching element and third switching element to maintain a turn-off state, and control the first switching element according to the sensed temperature, and in response to the operational state of the image forming apparatus being at a printing state, control the third switching element and fourth switching element to maintain a turn-off state, and control the first switching element and second switching element separately according to the sensed temperature.
- According to an embodiment of the present disclosure, a driving control method includes sensing a temperature of the fuser; generating a driving signal based on the sensed temperature; and providing external AC power selectively to a heating element of the fuser according to the generated driving signal; wherein the generating a driving signal involves, in response to an operational state of an image forming apparatus being at a waiting state, generating a driving signal using sections other than a phase angle of a range predetermined based on a peak voltage value of the external AC power.
- Meanwhile, the generating a driving signal may involve, in response to the operational state of the image forming apparatus being at a printing state, generating a driving signal using AC power of all sections.
- Meanwhile, the generating a driving signal may involve, in response to a temperature of the fuser being in a first temperature range, performing a phase control on the AC power being provided to the heating element to generate the driving signal, and in response to the temperature of the fuser being in a second temperature range that is higher than the first temperature range, performing a waveform number control on the AC power being provided to the heating element to generate the driving signal.
- Meanwhile, the generating a driving signal may involve generating a driving signal such that the AC power is not provided to the heating element in sections where the phase of the external AC power is 75 to 105 degrees and 255 degrees to 285 degrees.
- Meanwhile, the method may further include sensing a zero cross point of the external AC power, wherein the generating a driving signal involves generating the driving signal using the sensed zero cross point.
- Meanwhile, the generating a driving signal may involve comparing the sensed temperature and predetermined target temperature to compute a duty value, calculating a phase control time of the AC power to be provided to the fuser using the computed duty value and sensed zero cross point, and generating the driving signal based on the calculated phase control time.
- Meanwhile, the heating element may include a first heating element and a second heating element, and he providing external AC power selectively may involve, in response to the operational state of the image forming apparatus being at a waiting state, connecting the first heating element and second heating element in series and providing the external AC, and in response to the operational state of the image forming apparatus being at a printing state, connecting the first heating element and second heating element in parallel and providing the external AC.
- The above and/or other aspects of the present disclosure will be more apparent by describing certain embodiments of the present disclosure with reference to the accompanying drawings, in which:
-
FIG. 1 is a block diagram illustrating a simplified configuration of an image forming apparatus according to an embodiment of the present disclosure; -
FIG. 2 is a block diagram illustrating a detailed configuration of an image forming apparatus according to an embodiment of the present disclosure; -
FIG. 3 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment of the present disclosure; -
FIG. 4 is a view for explaining operations of a zero cross sensor ofFIG. 3 ;FIG. 5 is a view for explaining a phase control of avoiding a predetermined phase according to an embodiment of the present disclosure; -
FIG. 6 is a waveform diagram of power being provided to a fuser of a fuser according to an embodiment; -
FIG. 7 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment; -
FIG. 8 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment; -
FIG. 9 is a waveform diagram power being provided to a fuser of a fuser according to an embodiment; -
FIG. 10 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment; and -
FIG. 11 is a flowchart explaining a method for controlling operations of a fuser according to an embodiment of the present disclosure. - Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below to explain the present disclosure by referring to the figures.
- Prior to specifically explaining the present disclosure, the method of disclosing the present specification and the drawings will be explained below.
- First of all, the words used in the present specification and in the claims were selected from generally used terms in consideration of the functions of various embodiments of the present disclosure. However, the meanings of these words may vary depending on the intentions of one skilled in the art, technical interpretation, and advent of a new technology. Furthermore, some of the words herein may have been randomly selected by the applicant of this specification. These words may be interpreted to mean as defined in this specification, and unless there are specific definitions, they may be interpreted based on the overall disclosure of the present specification and the general technical common sense of one skilled in the art.
- Furthermore, like reference numerals in the drawings refer to like parts or components that perform substantially the same functions. For the sake of easy understanding an explanation, like reference numerals will be used in different embodiments as well. That is, even if like reference numerals are used in a plurality of drawings, it does not necessarily mean that all the drawings belong to the one same embodiment.
- Furthermore, words that include ordinal numerals such as “the first” and “the second” may be used to differentiate between the components in this specification and in the claims. These ordinal numerals are used to differentiate between the same or similar components, and thus the use of such ordinal numerals is not intended to limit the meanings of the words. For example, the order of use or order of arrangement of a component combined with such an ordinal numeral shall not be limited by that ordinal numeral. When necessary, the ordinal numerals may be exchanged between one another.
- Unless mentioned otherwise, any singular expression includes a plural expression. In the present application, words such as “include” or “consist of” are used to designate that the characteristics, numbers, steps, operations, components, parts or a combination thereof disclosed in the present specification exist, but not to exclude the possibility of existence or addition of one or more of other characteristics, numbers, steps, operations, components, parts or a combination thereof.
- Furthermore, in an embodiment of the present disclosure, a part being connected to another part includes the part being connected to the another part indirectly via another medium. Furthermore, a part including another component means that any other component may also be further included unless mentioned otherwise.
- Hereinafter, an embodiment of the present disclosure will be explained in further detail with reference to the drawings attached.
-
FIG. 1 is a block diagram illustrating a simplified configuration of an image forming apparatus according to an embodiment of the present disclosure. - Referring to
FIG. 1 , animage forming apparatus 100 according to the present embodiment consists of afuser 110 andfuser driver 200. Such animage forming apparatus 100 may be a printer, scanner, copy machine, facsimile, or an MFP (Multi Function Peripheral) configured to provide all the functions of a printer, scanner, copy machine, and facsimile through one apparatus. - The
fuser 110 fuses printing paper on which a toner has been developed. More specifically, thefuser 110 applies heat and pressure to the printing paper to fuse the electrified toner on the printing paper. Such afuser 110 may include a heating roller and pressurizing roller. - The heating roller may be heated to a predetermined temperature, and heat the printing paper so that the electrified toner on the printing paper may be easily fused.
- Such a heating roller has a heating element (for example, heater lamp) for heating a heating roller to a predetermined temperature. There may be one heating element or a plurality of heating elements in the heating roller. Such a heating element may be heated by the power provided from a
fuser driver 200 that will be explained hereinafter. - A pressurizing roller is a roller configured to provide high pressure on printing paper so that electrified toner may be easily fused. The pressurizing roller is pressure-welded to a heating roller and forms a nib.
- The
fuser driver 200 may be realized as a processor, ASIC, or CPU and the like. Thefuser driver 200 may control the power being supplied to the heating element so that the heating roller has a predetermined temperature state according to the operational state of theimage forming apparatus 100. For example, in response to theimage forming apparatus 100 being at a printing state, thefuser driver 200 may control the power being supplied to the heating element so that the heating roller has a predetermined temperature necessary for fusing. In addition, even in response to theimage forming apparatus 100 being at a waiting state or preparation state, for quick printing, thefuser driver 200 may control the power being supplied to the heating element so that the heating roller has a lower temperature than the temperature necessary for fusing. - The
fuser driver 200 may control the power being supplied to the heating element in a suitable control method depending on the temperature state of thefuser 110 and the operational state of theimage forming apparatus 100. - More specifically, in response to the operational state of the
image forming apparatus 100 being at an initial on state (or preparation state), thefuser driver 200 may control the power being supplied to the heating element in a phase control method of avoiding a predetermined phase according to an embodiment of the present disclosure. Herein, the phase control involves performing a phase control using the AC power of sections other than the phase angle of a predetermined range on the basis of the peak power peak value of an external AC power. This will be explained in more detail with reference toFIG. 5 below. - Furthermore, in response to the operational state of the
image forming apparatus 100 being at a printing state, thefuser driver 200 may perform a phase control on the power being supplied to the heating element using all sections of the AC power. - Furthermore, the
fuser driver 200 may control the power being supplied to the heating element in different control methods depending on the temperature of the fuser 110 (more specifically heating roller). More specifically, in response to the temperature of thefuser 110 being in a first temperature range, it is possible to perform a phase control regarding the AC power being provided to the heating element, and in response to the temperature of thefuser 110 being in a second temperature range that is higher than the first temperature range, it is possible to perform a waveform number control regarding the AC power being provided to the heating element. Herein, the waveform number control is a method of controlling such that a predetermined wave number is not provided to the heating element of the AC power being provided to the heating element. Meanwhile, even in the case of performing a waveform number control, it is possible to sequentially change the waveform number being transmitted. - Meanwhile, in the case where the
fuser 110 has a plurality of heating elements and it is possible to change the arrangement format of the plurality of heating elements, in response to the operational state of theimage forming apparatus 100 being at a waiting state, thefuser driver 200 may allow the plurality of heating elements to be connected in series regarding the AC power, and supply the power to the heating elements. In addition, in response to the operational state of theimage forming apparatus 100 being at a printing state, thefuser driver 200 may allow the plurality of heating elements to be connected in parallel regarding the AC power, and supply power to each of the plurality of heating elements. This arrangement type will be explained in more detail with reference toFIG. 8 . - As aforementioned, the
image forming apparatus 100 according to the present embodiment is capable of either not providing the power of a predetermined phase to a heating element at a preparation state that consumes a lot of power or connecting a plurality of heating elements in parallel to reduce the through-current being introduced into the heating elements, thereby preventing flickering and preventing noise from occurring in the inductor. - So far a simplified configuration of an image forming apparatus was illustrated and explained, but when realizing the image forming apparatus, various components may be further added. This will be explained in more detail with reference to
FIG. 2 . -
FIG. 2 is a block diagram illustrating a detailed configuration of an image forming apparatus according to an embodiment of the present disclosure. - Referring to
FIG. 2 , theimage forming apparatus 100 includes afuser 110,communication interface 120,display 130,manipulation input 140,storage 150, image former 160,controller 170, andfuser driver 200. - The
fuser 110 andfuser driver 220 perform a fusing function. In theimage forming apparatus 100, only thefuser 110 andfuser driver 200 may be referred to as the fuser, and the detailed configuration and operations of the fuser will be explained with reference toFIGS. 3 to 10 . - The
communication interface 120 may be connected to a terminal apparatus (not illustrated) such as a mobile device (smart phone, tablet PC), PC, notebook PC, PDA, and digital camera and the like, and receive file and printing data from the terminal apparatus (not illustrated). More specifically, thecommunication interface 120 may be formed to connect theimage forming apparatus 100 to an external apparatus, or to a terminal apparatus through LAN (Local Area Network) and internet, or to a USB (Universal Serial Bus) port or wireless communication (for example, WiFi 802.11a/b/g/n, NFC, Bluetooth) port. - The
display 130 displays various pieces of information to be provided in theimage forming apparatus 100. More specifically, thedisplay 130 may display a user interface window from which various functions provided by theimage forming apparatus 100 may be selected. Such adisplay 130 may be a monitor such as an LCD, CRT, and OLED, or a touch screen capable of performing functions of themanipulation input 140 to be explained at the same time. - Furthermore, the
display 130 may display a control menu for performing the functions of theimage forming apparatus 100. - The
manipulation input 140 may receive input by a user of selecting a function or a control command regarding a function. Herein, examples of the function include printing function, copying function, scanning function, and facsimile transmitting function. Such amanipulation input 140 may receive input through a control menu being displayed on thedisplay 130. - Such a
manipulation input 140 may be realized as a plurality of buttons, a keyboard, a mouse and the like. Otherwise, it may be realized as a touch screen that may perform the functions of theaforementioned display 130 at the same time. - The
storage 150 may store printing data received through thecommunication interface 120. Furthermore, thestorage 150 may store various fusing conditions (for example, temperature conditions according to the operational state of the image forming apparatus 100). Such astorage 150 may be realized as a storage medium provided inside theimage forming apparatus 100, an external storage medium, for example a removable disk including a USB memory, a storage medium connected to the host, or a web server through the network and the like. - The image former 160 may print printing data. More specifically, the image former 160 may parse a file pre-stored in the
storage 150 or printing data received from the terminal apparatus (not illustrated), and may render the parsed data and then print the rendered data on printing paper. - The
controller 170 controls each component inside theimage forming apparatus 100. More specifically, thecontroller 170 may be realized as a processor or CPU to determine the operational state of theimage forming apparatus 100. For example, in response to theimage forming apparatus 100 being initially turned on, or in response to determining that a printing operation will start soon (for example, when the user controlled the manipulation input or received printing data), thecontroller 170 may determine that the operational state of theimage forming apparatus 100 is at a preparation state (or ready state). Herein, thecontroller 170 may control thefuser driver 200 to have a fusing temperature according to an initial state. - Furthermore, in response to receiving printing data from outside and determining that it is at a state where operations such as parsing have been completed and thus a printing operation must start, the
controller 170 may determine that the operational state of theimage forming apparatus 100 is at a printing state. Herein, thecontroller 170 may control the image former 160 to perform a series of processes so that an electrified toner may be developed on printing paper, and also control thefuser driver 200 to have a temperature necessary for fusing. Furthermore, when the electrified toner is developed on the printing paper, thecontroller 170 may control thefuser 110 so that the electrified toner may be fused on the printing paper. - Furthermore, when a predetermined time has passed after a printing operation has been completed, the
controller 170 may determine that the operational state of theimage forming apparatus 100 is at a waiting mode. Herein, thecontroller 170 may control thefuser driver 200 such that thefuser 100 maintains a temperature that is lower than the temperature necessary for fusing. - Meanwhile, regarding
FIGS. 1 and 2 , it was explained that thefuser driver 200 performs fusing functions according to controls made by thecontroller 170, but thefuser driver 200 may be realized to perform fusing functions according to controls made by the image former 160 instead. Furthermore, thefuser driver 200 andfuser 110 may be realized as components provided inside the image former 160. - Furthermore, referring to
FIGS. 1 and 2 , only general functions of theimage forming apparatus 100 were illustrated and explained, but theimage forming apparatus 100 may further include a scanner configured to perform scanning functions according to the functions being provided by theimage forming apparatus 100 and a fax transceiver configured to perform fax transceiving functions according to the functions being provided by theimage forming apparatus 100. -
FIG. 3 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment. - Referring to
FIG. 3 , thefuser 300 includes afuser 110, input (or power supply) 210,circuit 220,temperature sensor 230,fuser controller 240,electricity transmitter 250, andharmonic inductor 260. - The
fuser 110 may include aheating element 111 configured to receive power through theharmonic inductor 260, and atemperature sensor 113 configured to sense the temperature of a heating roller inside thefuser 110. Such aheating element 111 may be provided with aheater lamp 112 configured to receive electric energy and generate heat energy. InFIG. 3 , the heating element and heater lamp are illustrated separately, but for the sake of easy explanation, the heating element and heater lamp will both be referred to as a heating element without differentiation. - The
input 210 receives external AC power, and provides the received AC power to thecircuit 220. - The
circuit 220 may receive AC power from theinput 210, sense a zero cross point of the received AC power, and transmit the AC power to theelectricity transmitter 250 selectively, according to controls made by thefuser controller 240. Such acircuit 220 may include a zerocross sensor 221 andelectricity switch 223. - The zero
cross sensor 221 senses a zero cross point of the received AC power. More specifically, the zerocross sensor 221 may include a resistor and photocoupler. - The resistor is connected to the
AC input 210 in parallel, and the photocoupler may transmit the voltage being applied to the resistor to thefuser controller 240 to be explained in an optical method. A sense signal being output from such a zerocross sensor 221 may have an analogue signal waveform of which the size has been reduced than the received AC power. Hereinabove, it was explained that the zerocross sensor 221 including a resistor and photocoupler is used, but a zero cross may be sensed using another type of circuit configuration. - The
electricity switch 223 may selectively output the AC power received in theinput 210 to the heating element. More specifically, theelectricity switch 223 may include a TRIAC. However, although the electricity switch hereinabove is configured using a TRIAC, other types of configuration, such as a relay switch, for example, may be adopted instead of the TRIAC as long as it is capable of control switching of AC power. - The
temperature sensor 230 senses the temperature of thefuser 110 based on a sensing value being received from thetemperature sensor 113 provided inside thefuser 110. Herein, thetemperature sensor 230 may provide a difference between a pre-stored target temperature value and a sensed sensing value to thefuser controller 240. However, in an embodiment, the sensed temperature information may be provided to thefuser controller 240. - The
fuser controller 240 controls operations of theelectricity switch 223 using the sensed zero cross point and the sensed temperature of thefuser 110. More specifically, thefuser controller 240 may include a zero cross convertor anddetector 241 andCPU 243. - The zero cross convertor and
detector 241 perceives the zero cross point using the signal transmitted through the aforementioned zerocross sensor 221. More specifically, the zero cross convertor anddetector 241 may receive a sine waveform of which the size has been reduced through thesensor 221, and generate a digital square wave reference signal from the analogue sine waveform signal. - The
CPU 243 receives temperature information from thetemperature sensor 230. Herein, theCPU 243 may receive a difference value between a target temperature value and the sensed temperature value, in which case a duty value may be computed based on the received information. However, theCPU 243 may be realized to receive only a currently sensed temperature value from thetemperature sensor 230, arithmetize a pre-stored target value and the sensed temperature value, and compute a duty value using the result of arithmetization. - Furthermore, the
CPU 243 may receive a reference signal of a square wave that is the zero cross point from the zero cross convertor anddetector 241, and receive operational state information of theimage forming apparatus 100 from thecontroller 170 of theimage forming apparatus 100. - Furthermore, the
CPU 243 may determine the method of controlling the heating element according to the operational state of theimage forming apparatus 100 and the sensed temperature state of thefuser 110, and generate a driving signal to control theelectricity switch 223 according to the determined controlling method. More specifically, in response to the operational state of theimage forming apparatus 100 being at a waiting state or preparation state, theCPU 243 may generate a driving signal in a phase control method of not using a predetermined phase. Furthermore, in response to the temperature of thefuser 110 being the same or above a predetermined temperature, theCPU 243 may generate a driving signal in a waveform number control method. - Meanwhile, in response to the operational state of the
image forming apparatus 100 being at a printing state, theCPU 243 may generate a driving signal in a phase control method using all the phases of the AC. - Herein, the phase control method is a method of providing only a predetermined phase of among the phases of the AC power to the heating element. In the present embodiment, a phase control is performed avoiding sections where currents change rapidly. More specifically, it is possible to perform a phase control such that the AC power is not provided to the heating element in a section where the phase of the external AC power is approximately 75 to approximately 105 degrees and approximately 225 to approximately 285 degrees. Below, operations of the
CPU 243 in the case of performing a phase control will be explained in detail. - In the case of being driven in a phase control method, the
CPU 243 compares the temperature of thefuser 110 and the target temperature to compute a duty value, and calculates a phase control time of the AC power to be provided to thefuser 110 using a previously sensed zero cross point. TheCPU 243 may then generate a driving signal based on the calculated phase control time. Herein, as aforementioned, theCPU 243 may generate a driving signal regarding sections other than a predetermined phase angle and not all the phases of the AC power. This will be explained in more detail hereinafter with reference toFIG. 5 . - Furthermore, in the case of being driven in a waveform number control method, the
CPU 243 may compare the temperature of thefuser 110 and the target temperature to compute a waveform number to be provided, calculate a waveform number time of the AC power to be provided to thefuser 110 using a previously sensed zero cross point, and generate a driving signal based on the calculated wave number time. - The
electricity transmitter 250 provides the AC power output from theelectricity switch 223 to thefuser 110 through theharmonic inductor 260. - The
harmonic inductor 260 provides the power transmitted from theelectricity transmitter 250 to theheating element 112 of thefuser 110. More specifically, for harmonic wave attenuation, theharmonic inductor 260 may be arranged between theelectricity transmitter 250 andfuser 110. However, although a harmonic inductor is used in the illustrated embodiments, other elements that include a coil such as an inductor or transformer may be used instead of the harmonic inductor as long as harmonic wave attenuation is possible. - As aforementioned, the fuser according to the
present embodiment 300 does not provide a predetermined phase that consumes a lot of power at a preparation state to the heating element, thereby preventing flickering. Furthermore, because it provides power to the heating element in a waveform number control method after an initial driving, noise may be prevented from being generated in the inductor. -
FIG. 4 is a view for explaining operations of a zero cross sensor ofFIG. 3 . - In the present embodiment, a phase control is used to control the power being input to the heating element, and for such a phase control, it is necessary to identify the exact phase of the AC power being input. Accordingly, the present embodiment uses a zero cross (ZC) signal. Herein, the ZC signal is a point where the power peak value of the AC signal is 0, that is, a point where the AC phase is 0 degrees or 180 degrees.
- Referring to
FIG. 4 , the zerocross sensor 221 outputs asensing signal 401 of which the voltage size of the sine waveform has been reduced using the resistor and photocoupler. Thefuser controller 240 that received such a sensing signal may generate a digital squarewave reference signal 403 from the analogue sine waveform signal received. -
FIG. 5 is a view for explaining a phase control of avoiding a predetermined phase according to an embodiment of the present disclosure. - Referring to
FIG. 5 , the AC power has a periodical phase angle of 0˜360 degrees. Meanwhile, a range predetermined based on the peak voltage value of the AC power (ex 90 degrees, 270 degrees) is a section where current changes rapidly, and in this section a phase control is performed such that the AC power (more specifically, rectified AC power) is not transmitted to the heating element. As such, because a switching element is not turned on in a section having a large through current, it is not only possible to prevent flickering, but also reduce noise in the inductor. - The aforementioned phase angle may be expressed in a predetermined time from the zero cross. For example, in the case of 50 Hz AC, the switching element may not be turned on in the ±1.5 ms section on the basis of 5 ms in an AC half-wave. Meanwhile, in the case of 60 Hz Ac, the switching element may not be turned on in the ±1.245 ms section on the basis of 4.15 ms in an AC half-wave.
-
FIG. 6 is a waveform diagram of the power being provided to a fuser of a fuser according to an embodiment. - At an inrush current state in the case of controlling the power being provided to the heating element, the fuser driver according to an embodiment of the
present disclosure 200 performs a mixed phase and waveform control. - Referring to
FIG. 6 , at an initial state of driving (section A), it is possible to perform a phase control of avoiding a predetermined phase angle as inFIG. 5 , and after the temperature of thefuser 110 is the same as or above a predetermined temperature (that is, section B), it is possible to perform a waveform number control. - The reason for mixing a phase and waveform number as aforementioned is to reduce noise of the harmonic inductor by performing a phase control and to reduce flickering by performing a waveform number control. In other words, at an initial driving point where a lot of flickering occurs, a phase control of not using a predetermined phase may be performed, and after the
fuser 110 is heated above a predetermined temperature, a waveform number control may be performed to reduce noise in the inductor. - Furthermore, the number of times of control may be changed from every 50 Hz to less than every 30 Hz to prevent noise and flickering at the same time. However, reducing the control frequency too much may deteriorate the heat characteristics of the heating element, and thus the frequency may be determined to minimize the effects to the heat characteristics. Especially, a lower limit for the frequency may be proposed so as not to affect the FPOT. That is, the control may be performed within a range between the lower limit and 30 Hz of the system.
-
FIG. 7 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment. More specifically, afuser 300′ according to the embodiment includes afuser 110′ having a plurality ofheating elements 111′. - Referring to
FIG. 7 , thefuser 300′ according to the embodiment includes afuser 110′,input 210,circuit 220,temperature sensor 230,fuser controller 240,electricity transmitter 250, andharmonic inductor 260. - The
fuser 110′ is provided with a plurality ofheating elements 111′, including first heating element 112-1 and second heating element 112-2 configured to receive power transmitted through theinductor 260. - The first heating element 112-1 is a heating element arranged at the center of a heating roller. The first heating element 112-1 may consume 700 w of power.
- The second heating element 112-2 is a heating element arranged at both sides of the first heating element 112-1. The second heating element 112-2 may consume 600 w of power.
- The
fuser 110′ is provided with a plurality of heating elements 112-1 and 112-2, and thus theelectricity switch 223 may switch the power being provided to each of the plurality of heating elements using a plurality of switching elements. - The
fuser controller 240 may determine the heating element to be used in a fusing process. More specifically, thefuser controller 240 may receive information on printing paper from thecontroller 170 of theimage forming apparatus 100, and determine to use only the first heating element 112-1 or the first heating element 112-1 and second heating element 112-2 at the same time depending on the received information on printing paper. - For example, in response to the received information on printing paper being less than a predetermined paper size, the
fuser controller 240 may determine to use only the first heating element 112-1, and perform a control on driving the first heating element 112-1. However, in response to the received information on printing paper being above the predetermined paper size, thefuser controller 240 may perform a control on driving both the first heating element 112-1 and second heating element 112-2. Herein, a same control method or a different control method may be used to each of the first heating element 112-1 and the second heating element 112-2. Specific control methods were explained hereinabove with reference toFIG. 3 , and thus repeated explanation will be omitted. - Meanwhile, when the operational state of the
image forming apparatus 100 is at a waiting mode or preparation mode, it is unknown with which printing paper the printing operation will be performed, and thus thefuser controller 240 may control such that power is provided to both the first heating element 112-1 and second heating element 112-2. - Configurations of the
input 210,circuit 220,temperature sensor 230,electricity transmitter 250, andharmonic inductor 260 are the same as inFIG. 3 , and thus repeated explanation will be omitted. - As aforementioned, even when using a fuser consuming a lot of power, the
fuser 300′ according to the present embodiment does not provide a predetermined phase that consumes a lot of power to a plurality of heating elements, thereby preventing flickering. -
FIG. 8 is a block diagram illustrating a detailed configuration of a fuser according to an embodiment. More specifically, thefuser 300″ according to the embodiment is provided with afuser 110′ having a plurality of heating elements, and a plurality of switching elements capable of changing the arrangement of the plurality of heating elements. - Referring to
FIG. 8 , thefuser 300″ may include afuser 110′,input 210, zerocross detector 221,fuser controller 240,inductor 260, and a plurality of switchingelements - The
fuser 110′ is provided with a plurality of heating elements 112-1, 112-2 configured to receive power transmitted through theinductor 260. - The first heating element 112-1 is a heating element arranged at a center of a heating roller. The first heating element 112-1 may consume 700 w of power.
- The second heating element 112-2 is a heating element arranged at both sides of the first heating element 112-1. The second heating element 112-2 may consume 600 w of power.
- The first heating element 112-1 and second heating element 112-2 may be connected in series or in parallel regarding the AC power by the plurality of switching
elements - The
first switching element 271 is arranged between theinductor 260 and first heating element 112-1, and thefirst switching element 271 may selectively provide external AC to the first heating element 112-1. More specifically, a first end of thefirst switching element 271 may be connected to a first end of theinductor 260, and second end of thefirst switching element 271 may be connected to a first end of the first heating element 112-1. - The
second switching element 272 is arranged between theinductor 260 and second heating element 112-2, and thesecond switching element 272 may selectively provide external AC to the second heating element 112-2. More specifically, a first end of thesecond switching element 272 may be connected to the first end of theinductor 260, and a second end of thesecond switching element 272 may be connected to a first end of the second heating element 112-2. - The
third switching element 273 may selectively connect a second end of the first heating element 112-1 and a second end of the second heating element 112-2. - The
fourth switching element 274 may selectively connect the second end of the first heating element 112-1 with the first end of the second heating element 112-2. - The
input 210 may receive AC power from outside, and provide the received AC power to theinductor 260 and zerocross sensor 221. - The zero
cross sensor 221 senses a zero cross point of the received AC power. Detailed configuration and operations of the zerocross sensor 221 were explained hereinabove with reference toFIG. 3 , and thus repeated explanation will be omitted. - The
fuser controller 240 changes the operational state of the plurality of switchingelements image forming apparatus 100. More specifically, in response to the operational state of theimage forming apparatus 100 being at a preparation state or waiting state, a turn-off signal may be applied to thesecond switching element 272 andthird switching element 273, and a turn-on signal may be applied to thefourth switching element 274 so that the first heating element 112-1 and second heating element 112-2 are connected in series. Furthermore, a driving signal may be applied to thefirst switching element 271. - Meanwhile, in response to the operational state of the
image forming apparatus 100 being at a printing state, a turn-on signal may be applied to thethird switching element 273, a turn-off signal may be applied to thefourth switching element 274, and a driving signal may be applied to each of thefirst switching element 271 andsecond switching element 272. Herein, a same or different signal may be provided to thefirst switching element 271 andsecond switching element 272. - Furthermore, the
fuser controller 240 may perform a waveform number control using the sensed zero cross point and temperature of thefuser 110′, and provide a driving signal according to the waveform number control to thefirst switching element 271 or to thefirst switching element 271 andsecond switching element 272. - As aforementioned, at a preparation state, the
fuser 300″ according to the present embodiment may connect the first heating element and second element in series, and reduce a through-current by an increase of resistance value. Accordingly, thefuser 300″ may supply power by a waveform number control, and accordingly sensitive noise will not occur. -
FIG. 9 is a waveform diagram of power being supplied to a fuser of a fuser according to an embodiment. More specifically,FIG. 9 (part a) is a waveform diagram of power being input in the case where a plurality of heating elements are connected in parallel, andFIG. 9 (part b) is a waveform diagram of power being input in the case where a plurality of heating elements are connected in series. - Referring to
FIG. 9 (part a) and 9 (part b), it can be seen that when the first heating element and second heating element are connected in series, the through-current of the fuser is reduced. - Because it is possible to reduce the through-current of the
fuser 110′ by changing the connection state of the heating elements as aforementioned, it is possible to use a waveform number control at a preparation state of theimage forming apparatus 100 as well, and accordingly sensitive noise will be significantly reduced. -
FIG. 10 is a view illustrating a configuration of a fuser according to an embodiment. - Referring to
FIG. 10 , thefuser 300″′ according to the embodiment includes afuser 110,input 210, zerocross detector 221,fuser controller 240,inductor 260,rectifier 290, andswitch 275. - The
fuser 110 is provided with aheating element 112 for receiving power transmitted through theinductor 260. - The
input 210 receives external AC power, and provides the received AC power to theinductor 260 and zerocross sensor 221. - One end of the
inductor 260 is connected to one end of theinput 210, and another end of theinductor 260 is connected to therectifier 290. - The
rectifier 290 rectifies the AC power transmitted through theinductor 260. Such arectifier 290 may be a bridge diode rectifier. - The
switch 275 may provide thefuser 110 with the AC power selectively rectified according to a control by thefuser controller 240. Thefuser 300″′ according to the embodiment rectifies the external AC power and uses the same, and thus thefuser 300″′ may perform a switching operation using a field-effect transistor rather than a current element. - Operations of the zero
cross sensor 221 andfuser controller 240 are the same as inFIG. 3 , and thus repeated explanation will be omitted. -
FIG. 11 is a flowchart for explaining a method for controlling operations of a fuser according to an embodiment of the present disclosure. - The temperature of the fuser is sensed (operation S1110). More specifically, the temperature of the fuser may be sensed through a temperature sensor arranged inside the fuser.
- A driving signal is generated (operation S1120). More specifically, a control method may be determined according to the operational state of the
image forming apparatus 100 and whether or not the arrangement of the plurality of heating elements may be changed, and a driving signal may be generated according to the determined control method and the sensed temperature. For example, in the case where the arrangement of the plurality of heating elements may be changed in a series format, in response to the operational state of theimage forming apparatus 100 being at a preparation state, it is possible to maintain the arrangement of the heating element in series and generate a driving signal according to a waveform number control. Furthermore, in response to the operational state of theimage forming apparatus 100 being at a printing state, it is possible to change the arrangement of the heating element in a parallel state, and perform a waveform number or phase control and generate a driving signal. - Meanwhile, in the case where the arrangement of the heating element cannot be changed, in response to the operational state of the
image forming apparatus 100 being at a preparation state and the temperature of the heating element being below a predetermined temperature, it is possible to generate a driving signal according to a phase control of avoiding a predetermined phase. Furthermore, in response to the operational state of theimage forming apparatus 100 being at a printing state or the temperature of the fuser being below the predetermined temperature, it is possible to perform a phase control or waveform number control of supplying power in all phases and generate a driving signal. - AC power is selectively provided to a heating element (operation S1130). More specifically, a driving signal may be applied to a switching element so that AC power is selectively provided to the heating element. However, alternatively, AC power may be primarily rectified, and the rectified AC power may be provided to the heating element.
- Therefore, a driving control method of a fuser according to the embodiment is capable of not providing a predetermined phase to the heating element at a preparation state that consumes a lot of power, and reducing the through-current being introduced into the heating element by connecting the plurality of heating elements in parallel, thereby preventing flickering and preventing noise from occurring in the inductor. The driving control method such as that illustrated in
FIG. 11 may be implemented on an image forming apparatus having the configuration ofFIG. 1 orFIG. 2 , or may be implemented on a fuser having a configuration ofFIG. 3 ,FIG. 7 ,FIG. 8 , orFIG. 10 , or on an image forming apparatus or fuser having other configurations. - Furthermore, the aforementioned driving control method may be realized as at least one implementation program for implementing the aforementioned driving control method, and such an implementation program may be stored in a computer readable record medium.
- Therefore, each block of the present disclosure may be implemented as a computer recordable code on a computer readable record medium. The computer readable record medium may be a device that stores data readable by a computer system.
- The foregoing exemplary embodiments and advantages are merely exemplary and are not to be construed as limiting the present disclosure. The present teaching can be readily applied to other types of apparatuses. Also, the description of the exemplary embodiments of the present disclosure is intended to be illustrative, and not to limit the scope of the claims, and many alternatives, modifications, and variations will be apparent to those skilled in the art.
Claims (20)
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KR1020150146110A KR20170045954A (en) | 2015-10-20 | 2015-10-20 | Image forming apparatus and merhod for controlling thereof |
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WO2019017557A1 (en) * | 2017-07-19 | 2019-01-24 | Hp Printing Korea Co., Ltd. | Controlling driver to supply power |
WO2020027387A1 (en) * | 2018-07-31 | 2020-02-06 | Hewlett-Packard Development Company, L. P. | Method for controlling fuser |
US11431277B2 (en) * | 2018-09-10 | 2022-08-30 | Hewlett-Packard Development Company, L.P. | Temperature estimation of step motor based on sensing voltage thereof |
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